With the right tires and the right rider, the wee can kick ass on gravel/dirt roads. Don't expect to be tearing up any single track though. I ride my wee at 70mph on loose gravel and dirt all the time. Deep sand can upset your apple cart quickly though. One thing to be careful of... when a 500 pound bike gets out of control or when you need to stop or slow down quickly on gravel or dirt, things can start to suck real bad! It has a LOT of inertia.
[I]When you think of the long and gloomy history of man, you will find more hideous crimes have been committed in the name of obedience than have ever been committed in the name of rebellion.[/I]
- C. P. Snow